CISA KEV · Known exploitedCritical

CVE-2021-1870

Apple iOS, iPadOS, and macOS

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

CVSS
9.8
EPSS
7.92%
94.1% percentile
CISA KEV
Listed
Published
2021.04.03
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability7.92%
Technical severityCVSS 9.8

Vulnerability overview

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Affected product and versions

Product
Apple iOS, iPadOS, and macOS
Affected versions
unspecified, < 14.4, >= 10.15 < 10.15.7, 10.15.7, >= 11.0.1 < 11.2, < 2.30.6, 32, 33
Fixed versions
14.4, 10.15.7, 11.2, 2.30.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2021.11.17
  1. 1
    Identify

    Confirm that Apple iOS, iPadOS, and macOS and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-1173
KEV added
2021.11.03
Ransomware use
미확인
CVE-2021-1870 — Apple iOS, iPadOS, and macOS | SECUFOCUS NOW